Electric system for operating bulkhead doors, hatches, &amp;c.



PATENTED OCT. 9, 1906. W. B. GOWLES. ELECTRIC SYSTEM EUR OPERATINGBULKHEAD DOORS,v HATGHES, 6m.-

APPLIOATIOK FILED JULY 11, 1904.

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I l J TTU/MN5 No. 833,125. PATENTED OCT. 9; 1906. W. B'. COWLES.-ELECTRIC SYSTEM FOR OPERATING BULKHEAD DOORS, HATGHES, 6m. APPLICATIONFILED JULY 11. 1904.

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....ll o um u We W. Y .I Wdh `l M ELECTRIC SYSTEM FOR OPERATING BULKHEADDOORS, HATGHES, &c.

Y No. 833.125.

PATENTED OCT. 9, 1906.

W. B. COWLES.

APPLICATION FILED JULYll, 1904.

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No. 833,125. Y PATENTED OOT. 9, 1906. W. B. OOWLBS.

ELECTRIC SYSTEM FOR OPERATING BULKHEAD DOORS, HATOHES, dao.

ArrLxoA'rlox funn JULY 11. 1904.

'I SHEETS-SHEET 4.

PATENTED OCT. 9, 1906.

W. B. COWLES. ELECTRIC SYSTEM POR OPERATING BULKHEAD DOORS, HATCHES, &o.

APPLICATION FILED JULYll, 1904.

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No. 833,125. EATENTEE OCT. 9, 1906. w. E. OOWLES.

ELEOTETO SYSTEM EOE OPERATING EULKEEAD DOORS, EATOEES, Oo.

APLLIOATION FILED JULY 11. 1904.

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W. B. OOWLES.

PATENTED OCT. 9, 1906.

ELECTRIC SYSTEM FOR OPERATING BULKHEAD DOORS, HATGHES, zc.

APPLICATION FILED JULYII,

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UNITED STATES PATENT '-oIFIoE.

TVILL'IAM BARNUM COWLES, OF CLEVELAND, OHIO, ASSIVGNOR TO THE LONG ARMSYSTEM COMPANY, OF CLEVELAND, OHIO, A CORPO- RATION OF OHIO.

Specification of Letters Patent. i

Patented oct. 9, 1906.

Appiicaaon' and Jui-y 11, 1904. snai im. 2126,142.

To all whom, t may concern.' i

Be it known that I, WILLIAM BARN'UM COWLEs, a citizen of the UnitedStates, residing` at Cleveland, in the'county of Cuyahoga and State ofOhio, ha ve invented' certain new and usefull Improvements inT4ElectricA Systems for Operating Bulkhead Dbrs, Hatches, &c. and I- dohereby declarethefollowing P y l I "thm, iparts.beinggbrlen-favifaye, 8is lan be a full, clear, and-e1act,.descniption of the invention, suchas will enablegthers.skjlldf in the art to which it appertains'to Y x,mode of-l`ock1ng the andisvhe'e .ofthe emer- 65 My invention relatestoim .rovementsin apparatus for 'operating bu khead door'is, hatches, orthe like by means of electricity;

"ar operating said doors Whether from al dis- 1 rent when the load onthe motor becomes ex cessive and also for signaling. when the door isclosed.

vMy invention also consists in certain de tails of apparatus and certaincombinations and arrangements of parts, as will b hereinafter more fullydescribed and claimed.

My present invention relates more especially to improvements on thegeneralsystem and the apparatus used in connection therewith asdescribed in United States Patent to Gr. H. Hill,.No. 650,973, g.: antcdJune 5, 1900; to F. T. Bowles, No. 651,004, granted June 5, 1900; tomyself, No. 729,280, granted May 26, 1903, and to myself, No. 743,252,granted November 3, 1903.

My present invention will be understood by reference to thelaccompanying drawings, in which the same parts are indicated by the samecharacters throughout the several views.

Figure 1 shows the vertical sliding watertight bulkhead-door fitted withthe apparatus for opening and closing the same, parts being broken awayand the door being in a closed position. Fig. 2.is a similar view, butwith the door partly open. Fig. 3 is a section along the line 3 3 ofFig. 1 and looking in the direction of the arrows, the parts being,.tion, the pa shown *on a large scale. Fig. a detail showing 'the'..1imitswitch, the emergency- 55 switeli, andthe controller, parts beingbroken away.` Fig. 5 shows a section along" the line- 5 50i-Fig. 3 `andlooking in the direction of .,.the arrpws;7 ,.-..Fig. 6 is a'detailjishmgfth -echamsmfof" tapping whe .Limit-swish@ end vievvf-oftheiemergencv-station as det'a'ehed 'f'its sup erts.` Fi 9shows theency-stationin the;in itialipositionl and for olding same against beingrotated Vtoo-farg Fig. 10 shows a'section of the emergency-sta# l."tion-'a'long the linev 10 10 of,Figs 7,'8, and 11 i the parts beingshown lon"enlargedscale as to 7o Figs. 7 and 8ifandfonthe san'iescaleasin Fig. 11.' Fig. -llv-'showsthe interiori-ofthe'emergency-station-after the ronticasinggorcover thereof, has beenremoved. i `fI `ig.-"'v12'fshows .the escaementfjor limiting'the speedofthev 75 circuit-c osir 'segmetat the enrer ency-stae".

rbemg shown` on a sll' further enlargvjdiscale than is indicated inFig.' 11.

Fig. 13 is aside view of the mechanism shown in Fig. 12 looking from theleft of said figure. 8o

Fig. 14 is a detail showing on a somewhat larger scale the double pawl.used in the escapement mechanism. Fig. 15 is a detail showing theconnection between the pawl and the balance-wheel. Fig. 16 shows in 85side elevation the operating-sector at the emergency-station. Fig. 17 1sa plan view of the device shown in Fig. 16, and Fig. 18 is a diagramillustrating the electric connections. Fig. 19 is a diagram showing theconnections 9o from the ships mains to three doors and from the threedoors to the emergency-sta-A tion. Referring first to Figs. 1 to 6, Arepresentsl the frame of the door, which is secured to the bulkhead andprovided with the usual tight-- eners, which not being a part of mypresent` invention will not be further described herein. To the bulkheadI also attached a stop or bu'er A to limit the upward travel of the rooion C', which meshes in the idler'D on'the I shaft D', which idlermeshes with the gear E, splined 011 the sleev'e F. This sleeveterminates at its lower end in the worm F', which is preferably hollow,as shown, and has secured on the inside thereof the sleeve F2, whichcarries the roller-bearings f. This sleeve F 2 is loose on a fixed shaftG, which is secured at one end in the bridge K, which spans thedoor-frame, and at the other end in the casing K', which for conveniencein assembling is made separate from but is secured to the casing fast tothe door-frame. This shaft G is shouldered, as g, g', and g2, and ishollowed out, as g, for purposes of lubrication'. The collars H and Hand H2 are all loose on this shaft G. Between the collars H and H' andinclosed in the sleeve F is a stout coil-spring I, which is held -underheavy compression between said collars, the amount of the initialcompression of the spring being regulated by means of the nuts G' andG2. The sleeve F is provided with a thickened head F3, shouldered, as atf2, to provide a bearing for the upper antifriction-bearing f', and thisthickened portion F3 is provided with an annular groove f 4 to receivethe yoke L, which is pivotally connected, by means of the pin L', to thearm M, which is pivoted, by means of the pin m, to the casing K'. Thisarm M is provided with a head M', having inclined faces m'and a centraloperating-lug.

m2. When the spring I is under normal compression, this arm M will be inthe position shown in Figs. 3 and 6, with the lug m2 midway between thetwo lugs n and n' on the yoke N, which yoke is fast to the rock-shaftN', connected to the cut-out or limit switch N2. This switch is providedwith two insulated contact-segments n* and ns, which normally makecontact with the contact-pieces n2 and n3, and thus complete the circuitwhen it is otherwise closed; but when this limitswitch is thrown out ofcontact the electric circuit to the motor is broken. This limitswitch ispreferably inclosed in the same box O with a suitable motor-controllerO', which is shown in diagram in Fig. 18. This controller is designed tobe o erated by a person at the door by means of tlie handle O2. Thecompression of the spring I is so adjusted that the sleeve F will besubstantially rigid against longitudinal movement on the shaft G duringthe ordinary operation of opening or closing the door; but if on closingthe door any serious obstacle is encountered-such, for instance, as aiece of timber, a bag of coal, orany metallic substance-the resistanceof the door to any further downward motion will cause the worm-rack B toreact on the worm-wheel F', pushing the sleeve F upward against theaction of the spring. This motion of the sleeve F will cause the yoke Lto swing the arm M about its pivot, causing the lug m2 to strike thelug` n', rocking the yoke N, and causing the shaft N' to' throw thelimit-switch N2 out of contact,

thus breaking the circuit and cutting off the current to the motor.4 Thesame result ha pens when the door is jammed down hrm y on its seat. Whenthe door reaches the upward limit of its travel, it is stopped by thebuffer A', or should the door encounter any other obstruction in openingthe worm-wheel F' will be pushed downward, compressing the spring androcking the shaft N' in the opposite direction, breaking the contactsmade by the limit-switch N2, and thus breaking the circuits. by themotion of the limit-switch, as just described, it cannot be closed againuntil either the pressure is relieved, when the springI willautomatically restore the parts to the initial position, or until thedoor has moved a sufficient distance after the current has been turnedon for moving the door in the opposite direction. The door may be closedonly from the emergency-station through the solenoid O3; but it ma beopened or closed by means of the contro ler operated by hand at the dooror by hand-power, as will be hereinafter described. I have provided aneinergency-station from which not only the single door in question; `butany number of doors, hatches, or the like may be closed by a singleoperator, which wil-l now be described. This emergency-station consistsof a switch mechanism designed to operate an emergencyswitch at eachdoor, by which latter the currentis thrown onto the motor for operatingthe door. 'The emergency-switch at each door consists of two movablecontact-segments t2 t3 and -two fixed contacts t and t', the movablecontacts being mounted to rotate on the same axis With the limit-switch7though independent thereof. These emergency-switches, one at each door,are each operated by a solenoid O3, the core of which connects, by meansof a link t, with a lug t' on the sleeve t8, carrying the movablecontacts of the switch. The core of the solenoid is returned to itsnormal josition by means of a suitable spring t".

he emergency-switches are thus operated by completing a circuit from asource of current throu h the solenoids at the respective doors, an thisis done by means of the emergency-station. The preferred 4form ofemergency-station and the details thereof are shown in Figs. 8 to 17,and the electrical circuit and connections are shown diagrammatically inFig. 18, which will hereinafter be described. In addition to theelectric control of the door I provide hand mechanism for opening andclosing the same, consisting of the pinion D2 on the shaft D', whichmeshes with Ithe pinion P on the same shaft with the pinion P', whichlast pinion meshes'with the pinion Q on the shaft Q'. This shaftprojects through the bulkhead and is adapted to have a hand-wheel Q2attached thereto on either or both sides of After the circuit has beenbroken IOO '19 and the ratchet-wheels 22 and 23.

the bulkhead. By turning this hand-wheel the door may be opened orclosed by hand' independent of the electrical power mechanism.

Referring now to Figs. 7 to 17, these figures show the emergency-stationby means of which the doors, hatches, or the like will be controlledfrom a central point, as from the'bridge or pilot-house of the vessel.The

emergency-station 8 comprises certain mechanism held in a suitable case,which for convenience of assembly is preferably made of two arts S andS2, provided with ears 45, whic i are secured together and to thebulkhead by bolts 46. Mounted in the rear ortion S2 of the casing is thearbor 3, w 'ch carries the loose sleeve 4, secured to or integral withthe pinion 5. (See Fig. 10.) This pinion 5 meshes with the toothedsector 6 on the arm 7, (see Fig. 11,) which arm 7 is pivoted at 8 and isconnected, as at 9, to a stout coil-spring 11, Whose tension',may beadjusted by means of the nut 12. The short end of the arm 7 is providedwith an abutment 10, which strikes the stop -10a just before the sector6 passes out of engagement with the pinion 5. 13 represents a Wheelwhich is secured fast to the sleeve 4 and inion 5, and mounted on thehub of this W eel 13 is the hub 14 of a Wheel 15, which is connected tosaid wheel v13 by the rollers 14, forming a roller-clutch connectionwhich will clamp the Wheel 15 to the Wheel 13 when the latter is movedin one' direction and which will allow the wheel 15 to turn freely onthe wheel 13 when the latter is moved in the reverse direction. Thiswheel 15 is provided with teeth 16, which mesh in the pinion 17 on thearbor 20. This arbor also carries the gear-wheel 18 and the ratchetwheel22, both of which are secured to and rotate with the pinion 17. Thegear-wheel 18 meshes with a similar gear-wheel 19 on the arbor 21, whichgear-wheel 19 is fast to the ratchet-Wheel 23. Between theseratchet-wheels 22 and 23 is mounted the double pawl 24, having engagingteeth 25 and 25a. (See Figs. 12 and 14.) This pawl is fast on the hub27a of the balance-Wheel 27. This balance-wheel 27 is perforated, as at28, to allow the arbors 20 and 21 to pass therethrough. The saidbalance-wheel is caused to vibrate through a small angle in reversedirections by means of the spring 11, which will cause the sector 6 torotate the pinion 5, and this will turn the wheels 13 and 15, causingthe teeth 16 to rotate the pinion 17 and through it th.' gear-wheels18Sand uppose the balance-wheel 27 is in the position indicated in Fig.12. The rotation of the ratchet-wheel 22 will cause the 'tooth 25 of thepawl 24 to rock the balance-wheel 27, and the wheel 27 will continuerevolving until the tooth 25a engages one of the teeth of theratchet-wheel 23. This will check the movement of the ratchet-wheel 23,and before the train of mechanism, including the ratchetwheel 23, cancontinue to revolve the motion of the balance-wheel 27 must be stoppedand reversed, and so this balance-wheel interposes a series of checks tothe train of mechanism actuated by the spring 11, and thus retards themotion of the wheel 13. This wheel 13 carries an insulatedconductingsegment 29, which is caused to pass over the brushes 30,connected to the wires 31 and 32, as will be hereinafter described. Aseries of incandescent-lamp sockets 33 is provided', so that when eachcircuit is completed a lamp 34 will glow. These lamps are behindopenings 35 in the front plate 2, which openings may be closed bycolored or numbered glass or mica lates 34a. (See Fig. 10.) The wheel 13is provided with a stop 36, which engages the arm 37 on the shaft 38, towhich the hand-wheel 39 is secured. This handwheel is provided with astop or stops 40, one of which engages in the notch 41 between the shortlug 42 and the longer lug 43. (See Fig. 9.) This stop 4() is normallyheld in engagement with said notch by means of the springs 44 and 44",which bear on the crosshead 44, loose on the shaft 38, and tend to ressthe arm 37, and with it the shaft 38 and and-wheel 39, inward. This stopwill therefore normally lock the wheel 13, and with it the pinion 5,against turning. If, however, t'he hand wheel is pulled out against theaction of the springs 44EL and 441 far enough to release the stop 40,the stop 36 on the wheel 13 will push the hand-wheel around under theinfluence of the spring 11. The arts are so arranged that thehandwheelwill turn through about one hundred and eighty degrees beforethe abutment 10 strikes the stop 10, and about the same time the stop 40on the hand-wheel will have rotated around to engage one of the lugs 43.This will prevent the hand-wheel from beingl turned by hand beyond thedesired position to the injury of the mechanism after the tension of thespring 11 has been taken off by means of the engagement of the abutment10 with the stop 10a. The parts may be rcstored to the initial positionby turning the hand-wheel backward and locking the stop 40 in the notch41. It will be seen that the balance-wheel 27 will cause the wheel 13,bearing the segment 29, to rotate slowly by a step-by-step motion andthat this speed of rotation normally controlled by the spring 11 may beincreased by supplementing the action of the spring by hand-powerapplied to turn the hand-wheel. This slow step-bystep motion isimportant to prevent excessive loads being thrown on the dynamo or othersource of electric current when it is desired to close'a lseries ofdoors or hatches or the like from an emergency-station. Tluw` IDO l. l1.l

the effect of simultaneously starting and of simultaneously closing alarge number of doors orl hatches would impose an vexcessive load uponthe source of current, while by cutting the doors in circuity seiatimthe load is distributed, and for this purpose I arrange that there shallbe a brief interval between the successive closing of the circuitsconnected to the several doors or hatches. This is secured by thestep-by-step motion of the segment already described. In order todetermine whether the various doors,hatches, &c., are closed, I providea push-button or switch 50, which when operated will cause theindicating-lamps b c d to glow when these circuits are otherwise closed,as hereinafter described. Electric connections with theemergency-station are made by-mean`sof the, conduits s and junction-boxS3.

Having described the. construction of the parts at the emergency-station'and at one of the doors, I will now describe'the electric circuits andhow they are completed by the operations of the ap aratus,and for thispurpose I will refer to t ie diagram Fig. 18. One terminal of each oftheindicator-lam s 34 is connected to a common lead-wire from thepositive ship-main Z, While r the other terminal of each lamp isconnected by a'jseparate wireasW, to a switch U'a't eachd'oor' The firsttwo stationary spring-contactsBO are connected together.l to themain Z,whileA the successivef'contacts 30 :are separately connected to theY"solenoid O3 ofthe-emer-I gency-switch at each door. All of the wiresfrom the einer ency-station lead through the junction-box 3, in which afuse S* is connected in the circuit of each wire. In addi-v tion to theregular indicator-lamps 34 there is a red lamp 34, connected asshown,which will light up as soon as the connection with the first sprin-contact 30 is established and remain lighte as long as theemergency-station is in operation. The other lamps light up only whenthe push-button 50 1s operated. The controller is contained in theleft-hand end of the box O and its mechanical construction, which formsno part of this' invention, is not shown. This controller` however, maybe of any suitable construc-; tion for operating the motor C, which ispref-l erably compound-Wound. In the diagram' the controller is shown indevelopment/in which 1 10X indicate the stati( )i1 'a 7jf fc'oir-KItacts and terminals and 0,-' o, o-,'aiid-f'o' movable segments. Wires Xand: Xv-,lfdz to the motor-armature, X3 andgX4 to2-thel i" ries fields,and X5 to the shunt. 'a TheV switch and emergency-switch are-bothl'alsoshown in development. The electricf-;circuits completed by theoperationfoftheja"1; paratus'may be traced as lfollows: llV'lientlliecontact-segment 29 has moved'farenoughfto engage the first, orpreferably ythe first-two;l spring-contacts 30, which :arecO'nneCtedftO-.l

This operation of the emergency-switch comtraced as follows: from themain to controller-contact 7X, t ie right-hand pletes the circuit fromthe ships mains to thev motor at door No. 1-, which circuit may beositive ship- A controller-contact 10-X;j The Y 7S t3 into engagementwith contacts t and t.

`limit-switch, contact n3, emergency-switch contacts t and t3 throughthe controller to vthe motor, and back to emergency-switch contactsA#and t, thence through contacts n2 of the :limit-switchftovcontroller-contact 10X, and back-,to the negative ships main. The motorthen'starts, and-ifany abnormal resistance is encountered thelimit-switch will be' operated, fas described, and will break connectionbetween ,its movable contact n* `and its stationary', contact n2, thuscutting off the current from' the motor and causing it to stop.' Thisreverse action takes place also when' thejdoor'has reached either theupper or lower limit of its travel, the movable contact n? breakingconnection with the stationary contact 11,3. It will be noted that the`movable contacts ofthe limit-switch are normally in-enga ement with allofthe stationary contacts "teo yW'hen the door closes, it operates aswitch U, which partially closes the circuit ofthe lamp intended toindicate the closure of l door operated, which when the push-button 50is operated will light up. The circuit of this lamp may be traced asfollows1irom the positive ship-main to wire W,

through the junction-box S3 to push-button indicator-wire Wl to contact9X, switch limit-switch contact .n2 on left, contact 10X, and back tonegative ships main. While I have shown the electrical -connections fromA4the emergency-station tobnedoor only, this station is intended tooperate a large number of doors-twenty-five 'in the case shown.Vf-Tlifconnerftio'n s, however, from the emerj .genys all of the doorsare the sameb` fffwvires lead from the junction-box e'rg'xenc'y-stationto-each door, one of Ftlisewjres-{for carryin'g''current to operateej'emergency-switch -andff'one for carrying 'lent'to operate" the'signal-lamp correpondin'g to the dooroperatedilgsWrres W3 land W4 (seeFigs`. 18 and 19) represent `the emergencyswitch-'and indicator-wires,re-

spectlvely, leading toldoor No.' -2 and wires W5 and W6 (see Fig. 19)represent the emergency-switch and indicator-wires leading to oor N o;These pairs of Wires correspond- 50, thence through lamp 34 (No. 1,)through ing to the wires W and W2, lea ding to door No. 1, and all theother connections are substantially duplicates of those leading to doorNo. l and illustrated in detail in Fig. 18. As the segment v29 continuesto rotate the spring-contacts are brought one by one into engagementwith said segment, and thus act to complete `circuits toemergencyswitches at the successive doors and also act to cause theindicating-lamps to be connected up successively in each case just asdescribed above.

It will be obvious that various modifications may be made in theherein-described apparatus, in the electric connections, and in thecombination and arrangement of parts Which might be used withoutdeparting vfrom the spirit of my invention.

Having thus described my invention, What I claim, and desire to secureby Letters Patent of the United States, is

1. In a system of the character described, the combination with a dooror hatch, of an electric motor, and earing driven by said motor foroperating t e door or hatch, a coilspring under compression connected toa member of said gearing, and yielding when the load on said gearingexceeds a predetermined limit, means for adjusting the normalcompression of said spring, and means controlled b the yielding of saidspring for cuttin off tliie current from said motor, substantial y asdescribed.

2. In a system of the character described, the combination with a dooror hatch, of an electric motor, and earing driven by said motor foroperating t e door or hatch, a coilspring under compression connected toa member of said gearing, and yielding when the load on said gearingexceeds a predetermined limit, means for adjusting the normalcompression of said spring, and a cut-out switch controlled by theyieldinor of said spring, for cutting off the current Irom said motor7substantiaIl as described.

3. In asystem o the character described, the combination with a door orhatch and a worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on said shaft, a worm-Wheel secured to orintegral with said sleeve and en aging in said rack, gearing for drivingsaiiI worm-Wheel from said motor, a coil-spring under compressionmounted between said shaft and sald sleeve and yieldiny when the axialpressure on said Worm-Whee exceeds a predetermined limit, and meanscontrolled by the axial motion of said sleeve, due to the yielding ofsaid spring, for cutting 'off the current from said motor when the loadbecomes excessive, substantially as described.

4. In a system of the character described, the combination with a dooror hatch and a worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on i" y "Y sa'd shaft, a Worm-Wheel secured toor integral with said sleeve and engaging in said rack, gearing fordriving said worm-wheel from said motor, a coil-spring under compressionmounted between said shaft and said sleeve and yielding When the axialpressure on said Worm-whee exceeds a predetermined limit, and a cut-outswitch controlled by the axial motion of said sleeve, due to theyielding of said spring, for cutting off the current from said motorwhen the load becomes excessive, substantially as described.

5. In a system of the character described, the combination With a dooror hatch and a* Worm-rack secured thereto, of an electric motor, and aWorm-Wheel driven by said motor engaging in saidrack, a coil-springunder compression connected to said Worm- Wheel, and yielding when theload on said gearing exceeds a predetermined limit, means for adjustingthe compression of said s ring, and a cut-out switch controlled by t eyielding of said spring, for cutting off the current from said motor,substantially-as described.

6. In a system of the character described, the combination with a dooror hatch, of an electric motor, and earing driven -by said motor foroperating t e' door or hatch, a coilspring under compression connectedto a mem er of said gearing, and yielding when the load on said gearingexceeds a predetermined limit in either opening orfclosing the door orhatch, means for adjustingthe com ression of said spring, and meansautomatica ly controlled b the yielding of said spring for cutting off te current from said motor when the load becomes excessive, substantiallyas described.

7. In a system of the character described, the combination with a dooror hatch, of an electric motor, and earing driven by said motor for(perating t e door or hatch, a coilspring un er compression conneced toa member of said gearing, and yielding when the load on said gearingexceeds a predetermined limit in either opening or closing the door orhatch, means for adjusting the compression of said sprin and a cut-outswitch automatically control ed by the yielding of said spring, forcutting of the current from said motor when the load becomes excessive,substantially as described.

8. In a system of the character described, the combination with a dooror hatch, of an electric motor, and gearin driven by said motor foroperating the oor or hatch, a spring under compression connected to amember of said earing, and yielding in When the load on sai gearingexceeds a predetermined limit in either opening or closing, means forturning on the current to said motor either from adistance or locally,and means automatically controlled by the yielding of said spring forcutting oifthe current from IOC ISO

said motor when the load becomes excessive, substantially as described.

9. In a system of the character described, the combination with a dooror hatch, of an electric motor, and gearinr driven by said motor foroperating the door or hatch, a spring under compression connected to amember of said gearing, and yielding when the load on said gearingexceeds a predeterminedlimit in either opening or closing, means forturning on the current to said motor either from adistance orlocally,and a cutout switch automaticallycontrolled by the yielding of saidspring, for cutting off the current from said motor when the loadbecomes excessive, substantially as described.

10. In a system of the character-described, the combination witha doororhatch, of an electric motor,and gearing driven by said motor foroperating the door or hatch, a coilspring under compression connected toa memberA of said gearing, and yielding when the load: on said gearingexceedsa predetermined limit, means for adjusting thenormal compressionof said spring, means for turning on the current to saidmotor eitherfrom a distance or locally, and means'controlled' by the yielding ofsaid spring for cutting off the currentfrom said motor, substantialy asdescribed.

11. In a system of the character described, the combination with a dooror hatch, of an electric motor, and caring driven by said motorfor-operating t e door or hatch, a coilspring under compressionconnectedto a member of said gearing, and yielding When the load on said gearingexceedsa predetermined limit, vmeans for adjusting the normalcompression of said spring, means for turning on the current to saidmotor either from a distance or locally, and a cut-out switch controlledby the yielding of said spring, for cutting off the current from saidmotor, substantially asdescribed.

12. In a system of the character described, the combination with a 'dooror hatch and a worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on said shaft, a worm-wheel secured to orintegral with said sleeve and engaging in said rack, gearing for drivingsaid worm-Wheel from said motor, a coil-spring under compression mountedbetween said shaft and said sleeve-and yielding when the axial pressureonsaid worm-wheel exceeds a predetermined limit, means for turning onthe current to said motor either from a distance orlocally, and meanscontrolled by the yielding of said spring for cutting off the currentfrom said motor when the load becomes excessive, substantially asdescribed.

13. In a system of the character described, the combination with a dooror hatch anda worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on said l shaft, a Worm-wheel secured to orintegral I with said sleeve and en aging in said rack, gearing fordriving said worm-wheel from said motor, a coil-spring under compressionmounted between said shaft and said sleeve and yieldinor when the axialpressure on said worm-whee exceeds a predetermined limit, means forturnin on the current to said motor either from a istance orlocally, andacutout switch controlled by the axial motion of said sleeve, due to theyielding of said spring for cutting off the current from said motor whenthe load becomes excessive, substantially as described.

` 14. In a system of the character described,`

Worm-rack secured thereto, of an electric motor, and a Worm-wheel drivenby said motor -engaging in said rack, a coil-spring under compressionconnected to said worm-wheel, and yielding when the load onsaid'ge'aring exceeds a predetermined limit, means vfor adeither fromadistance or'locally, and a cutspring, for cutting off the current fromsaid j motor, substantia y as described.

15. In a system of the character described',

electric'motor, and gearing driven by said' motor for operating the dooror hatch','a coilspring under compression connected tov a member of saidgearing, and yielding when the load on said gearing exceeds apredetermined limit in either opening or closing the door or hatch,means for adjusting the compression of said spring, means for turning onthe current to said motor either from a distance or locallv, and meansautomatically controlled by the yielding of said spring for cutting ofl1the current from said motor when the load becomes excessive,substantially as described.

16. In a system of the character described, the combination with a dooror hatch, of an electric motor, and gearing driven 'by said motor foroperating the door or hatch, a coilspring under compression connected toa member of said gearing, and yielding when the load on said gearingexceeds a predetermined limit in either opening or closing the door orhatch, means for adjusting the compression of said spring, means forturning on the current to sald motor either from a distance or locally,and a cut-out switch automatically controlled by the yielding of saidspring, for cutting off the current from said motor when the loadbecomes excessive, substantially as described.

17. In a system of the character described, the combination with a dooror hatch and a worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on said shaft, a worm-wheel secured to orintegral the combination with a dooror hatch, 'ol'an the combinationwith a door or hatch and a justing'the compression-of said spring',means for turning on the current to said motor out switch controlledbythe yielding of said I TOO @sans n with said sleeve and engaging insaid rack, gearing for driving sairhworm-wheel from said motor, acoil-spring under compression mounted between said shaft and said sleeveand yielding when the axial pressure on said worm-wheel exceeds apredetermined limit, a pivoted arm controller by the axial motion ofsaid sleeve, due to the yielding of said spring, and means operated bysaid arm for cutting oli the current from said motor when the loadbecomes excessive, substantially as described.

18. In a system of the character described, the combination with a dooror hatch and a worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on said shaft, a worm-wheel secured to orintegral with said sleeve and engaging in said rack, gearing ior drivingsaid worm-wheel from said motor, a coil-spring under compression mountedbetween said shaft and said sleeve yielding when the axial pressure onsaid worm-wheel exceeds a predetermined limit, a pivoted arm controlledby the axial motion of said sleeve, due to the yielding of said spring,and a cut-out switch operated by said arm for cutting ofi the currentfrom said 1no tor when the load becomes excessive, substantially asdescribed.

19. In a system ofthe character described,

' the combination with a door or hatch and a worm-rack secured thereto,of an electric motor, a fixed shaft, 'a sleeve mounted on said shaft, aworm-wheel secured to or integral with said sleeve and engaging in saidrack, gearing for driving said worm-wheel from said motor, a coil-springunder compression mounted between said shaft and said sleeve andyielding when the axial pressure on said worm-wheel exceeds aredetermined limit, a pivoted arm controlled)by the axial motion of saidsleeve, due to the yieldingof said spring,

a rock-shaft, and a cut-out switch connected thereto, both operated bysaid arm, for cutting off the current from said motor when the loadbecomes excessive, substantially as described.

20. In a system of the character described, the combination with a dooror hatch and a worm-rack secured thereto, of an electric motor, a fixedshaft, a sleeve mounted on said shaft, a Worm-wheel secured to orintegral with said sleeve and engaging in said rack,

1 gearing for driving said worm-wheel from said motor, a coil-springunder compression mounted between said shaft and said sleeve andyielding when the axial pressure on said worm-wheel exceeds apredetermined limit, a pivoted arm controlled by the axial motion ofsaid sleeve, due to the yielding of said spring, a rock-sh aft, and acut-out switch connected thereto, both operated by said arm, for cuttingofi' the current from said motor when the load becomes excessive, withmeans for turning on the current either from a distance or locally atthe door, substantially as described. u

21. In a system of the character described, the combination With'aseries of doors, of an electric motor at each door, gearing driven bysaid motor for operating the door, a spring at each door undercompression and connected to a member of said gearing, and yielding whenthe loadlon said gearing exceeds a redetermined limit, means for turningon t e current to all of said-motors seriatim from a distance, means forturning the current on or ofi at each door locally, and means controlledby the yielding of said spring for cutting off the current from itsmotor, substantially as described.

22. In a system of the character described, the combination with aseries of doors, of an electric motor at each door, gearing driven bysaidmotor for operating the door, a spring at each door undercompression and connected to a member of said gearing, v and yieldingwhen the load on said gearing exceeds a predetermined limit, means forturning the current on or off to all of said motors seriatim from adistance, means for turning cut-out switch at each .door controlled bythe yielding of said spring for cutting off the current from its motor,substantially as described.

23. In a system of the character described, the combination with aseries of doors and a worm-rack secured thereto, of an electric motor ateach door, and a worm-wheel driven by said motor engaging in said rack,a coilspring at each door under compression and connected -to saidworm-Wheel, and yielding when the load on the gearing exceeds apredetermined limit, means for turning on the current .seriatim from adistance, means for adjusting the compression of said spring, and acut-out switch controlled by the yielding of said spring, for cuttingoff the current from said motor, substantially as described.

24. In a system of the character described, the combination with aseries of doors and a worm-rack secured thereto, of an electric motor ateach door and a worm-wheel driven by said motor engaging in said rack, acoilspring at each door under compression and connected to saidworm-wheel, and yielding when the load on the gearingexceeds apredetermined limit, means for turning on the current to all of saiddoors seriatim from a distance, and means for turning the current on orofi at each door locally, means for. adjusting the compression of saidspring, and a cut-out switch controlled by the yielding of said spring,for cutting oi the current from said motor, substantially as described.

25. In a system of the character described, the combination with aseries of doors, of an electric motor at each door, gearing driven bysaid motor for operating the door, a

on the current at each door, locally, and a IIO spring at each doorunder compression and connected to a member of said gearing, andyielding when the load on said gearings exceeds a predetermined limit,automatic stepby-step mechanism for turning on the current to all ofsaid motors seriatim from a distance, means for turning the current onor off at each door locally, and means controlled by the yielding ofsaid spring for cutting off the current from its motor, substantially asdescribed.

26. In a system of the character described, the combination with aseries of doors, of an electric motor at each door, gearing driven bysaid motor for operating'the door, a spring at each door undercompression and connected to a member of said gearing, and yielding whenthe load on said gearing exceeds a predetermined limit, automaticstepby-step mechanism for turning on the current to all of said motorsSeniat/im from a distance, means for turning the current on or olf ateaclidoor locally, and a cut-out switch at each door controlled by theyielding of said spring for cutting off the current from its Inotor,substantially as described.

27. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatfim from a distant point, substantially as described.

2S. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turn ing on the current to said motorssertat'im from a distant point, and automatic mechan-' ism for cuttingofi` the current from any one of said motors when the load on said motorexceeds a predetermined limit, substantially as described.

29. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriattm from a distant point, and automatic mechanism for cutting oilthe current from any one of said motors when the load on said motorexceeds a predetermined limit, substantially as described.

30. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of means forturning on the current to said motors seriatt'm from a distant point,with means for indicating at the distant point when the current isturned on to and off the motor, substantially as described.

31. In a system of the character described, the combination with aplurality. of electric motors with mechanism driven thereby, ofautomatic step-by-step mechanism for turning on the current to saidmotors ser'iatim from a distant point, with means for indicating at thedistant point when the current is turned on to and off from each motor,substantially as described.

32. In a system of the` character described, the combination with aplurality of' electric motors with mechanism driven thereby, of meansfor turning on the current to said motors seM/atim from a distant point,and automatic mechanism for cutting ofl' the current from any one ofsaid motors when the load on said motor exceeds a predetermined limit,With means for indicating at the distant point when the current isturned-on to and 0H from each motor, substantially as described.

33. In a system of the character described, the combination With aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatim from a distant point, and automatic mechanism for cutting offthe current from any one of said motors when the load on said motorexceeds a predetermined limit, with means for indicating at the distantpoint when the current is turned on to and oil` from each motor,substantially as described.

34. In a system of the character described, the combination with aplurality of electric motorswith mechanism driven thereby, of automaticstep-by-stepmechanism for turning on the current to said motors seriatimfrom a distant point, comprising a spring un der tension, a train ofgearing operated by said spring, a conducting-segment operated by saidtrain of gearing, a pair of ratchet- Wheels driven in reverse directionsby said train of gearing, a balance-wheel, and a doulroo ble paWl faston the shaft of said balance- I Wheel and adapted t0 alternately engagesaid ratchet-wheels, substantially as described.

35. In a system of the character described, the combination with aplurality of electric motors with mechanism driventhereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatim from a distant point, comprising a spring under tension, atrain of gearing operatedby said spring, a conducting-segment operatedby said train of gearing, a pair of ratchet- Wheels driven in reversedirections by said train of gearing, a balance-Wheel, and a doublepawlfast on the shaft of said balance- Wheel and adapted. to alternatelyengage sald ratchet-Wheels, and automatic mechanism for cutting ofi thecurrent from any one of said motors when the load on said motor exceedsa predetermined limit, substantially as described.

36. In a `system of the character described, the combination With aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turnratchet-wheels, and automatic mechanismfor cutting off the current from any one of said motors when the load onsaid motor exceeds a predetermined limit, substantially as described.

37. In a system of the character described, thecombination with aplurality of electric motors with mechanism driven thereby, of means forturning on the current to said motors sem'atim from a distant point,comprising,

a spring under tension, a train of gearing operated by said spring, aconducting-segment operated by said train of gearing, a pair ofratchet-wheels driven in reverse directions by said train of gearing, abalance-Wheel, and a double pawl fast on the shaft of said balancewheeland adapted to alternately engage said ratchet-wheels, with means forindicating at the distant point when the current is turned on to and offthe motor, substantially as described.

38. In a system of the character described, the combination with aplurality of electric motors, with mechanism driven thereby, ofautomatic step-by-step mechanism for turning on the current to saidmotors seria/tim from a distant point, comprising a spring undertension, a train of gearing operated by said spring, aconducting-segment operated by said train of gearing, a pair ofratchetwheels driven in reverse directions by said train of earing, abalance-Wheel, and a double pawlg fast on the shaft of said balancewheeland adapted to alternately engage said ratchet-Wheels, with means forindicating at the distant oint when the current is turned on to and ofrom each motor, substantially as described. 39. In a system of thecharacter described, the combination with a plurality of electric motorswith mechanism driven thereby, of means for turning on the current tosaid motors seriatim from a distant point, comprising a spring undertension, a train of gearing operated by said spring, a conductingsegment o erated by said train of gearing, a pair of ratc et-wheelsdriven in reverse directions by said train of earing, a balance-Wheel,and a double pawl ast on the shaft of said balance-Wheel and adapted toalternately engage said ratchet-Wheels, and automatic mechanism forcutting off the current from any one of said motors when the load onsaid motor exceeds a predetermined limit, with means for indicating atthe distant point when the current is turned on to and off from eachmotor, substantially as described.

40. In a system ofthe character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsserz'ct'im from a distant point, comprising a spring under-tension, atrain of gearing operated by said spring, a conducting segment operatedby said train of gearing, a pair of ratchet- Wheels driven in reversedirections by said train of eaiing, a balance-wheel, and a double pawfast on the shaft of said balance- Wheel and adapted to alternatelyengage said ratchet-wheels, and automatic mechanism for cutting off thecurrent from any one of said motors When the load on said motor exceedsa predetermined limit, with means for indicating at the distant pointwhen the current is turned on to and off from each motor, substantiallyas described.

41. In a system of the character described, the combination With aplurality of electric motors With mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriat'im from a distant point, comprising a spring under tension, asector-arm engaged by said spring, a conducting-se ment and a train ofgearing operated by sai sector-arm, a pair of ratchet-Wheels driven inreverse directions by said train of earing, abalance-wheel, and a doubleaWl ast on the shaft of said balance-Whee and adapted to alternatelyengage saidratchet-Wheels, substantially as described.

42. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatim from a distant point, comprising a spring under tension, asector-arm engaged by said spring, a conducting-segment and a train ofgearin operated by said sector-arm, a air of ratc et-Wheels driven inreverse directions by said train of gearing, a balance-wheel, and adouble pawl fast on the shaftof said balance-wheel and adapted toalternately engage said ratchet wheels, and automatic mechanism forcutting off the current from any one of said motors when the load onsaid motor exceeds a predetermined limit, substantially as described. y

43. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motors semattmfrom a distant point, comprising a spring under tension, a sector-armengaged by said spring, a conducting-segment and a train of gearingoperated by said sector-arm, a pair IOO IIO

of ratchet-wheels driven in reverse directions by said train of caring,a balance-wheel, and a double pawl vast on the shaft of saidbalance-wheel and adapted to alternately engage said ratchet-wheels, andautomatic mechanism for cutting off the current from any one of saidmotors When the load on said motor exceeds a predetermined limit,substantially as descrrbed.

44. In a system of the character descrbed, the combination-With aplurality of electric motors with mechanism driven thereby, of means forturning on the current to said motorsseriatim from -a distant point,comprising a spring under tension, .a lsector-arm engaged by saidspring, a lconducting-segment and a train of gearing operated bysaid'seetor-arm, .a pair of ratchet-Wheels driven 4in reverse directionsby said train of gearing, a balance-Wheel, and a double pawl fast on theshaft of said balance\vheel :and ada ted to alternately engage saidratchet-Whee s, With means for indicating at the distant point when thecurrent is turned on to and off the motor, substantially as described.

.45. In a system of the character described, the combination with .aplurality of electric motors Withmechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatim from a distant point, comprising a spring Under tension, asector-arm engaged by said spring, a conducting-segment and a train ofgearing operated by said sector-arm, a pair of `ratchet-wheels driven inreverse directions by said train of gearing, va balance-WheeL-and adouble pawl fast on the shaft of said balancefwheel and .adapted toalternately engage said ratchet-Wheels, -with means for 4indieating atthe distant point when the current is turned on to and ofi` from eachmotor, substantially as described.

46. Ina-system of the character described, the combination with aplurality of electric motors with mechanism driven thereb of means forturning on the current to saidy motors serviatim from a distant point,comprisa spring .under tension, aAsector-armengaged by said spring, aconducting-segment and a train of gearing operated by said sectonarm, -apair of ratchet-Wheels driven in reverse directions by said train ofgearing, la balance-wheel, and a double pawl fast on the shaft of saidbalance-wheel. and adapted to alternately engage said ratchet-Wheels,and automatic mechanism for cutting off the current from any one of saidmotors when the load on said motor exceeds a predetermined limit,-Withmeans for indicating at the dis.- tant point when the current is turnedon w and off from each motor, substantiallyas described.

automatic step-by-step mechanism for turning on the current to saidmotors Serictim from a distant point, comprising a spring under tension,a sector-arm engaged by said spring, a conducting-segment and a train ofgearing operated by said sector-arm, a pair of ratchet-wheels driven inreverse directions by said train of caring, a balance-Wheel, and adouble pawl ast on the shaft of said balance-wheel and adapted toalternately engage said ratchet-Wheels, and automatic mechanism forcutting off the current from any one of said motors when the load onsaid motor exceeds a predetermined limit, with means for indicating atthe distant point when the current is turned on to and off from eachmotor, substantially as described.

48. Ina system of the character described, the combination With aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turn ing on the current to said motorsserviatim fromla distant point, comprising a spring under tension, asector-arm engaged by said spring, a conducting-segment and -a train lofgearing operated by said sector-arm, a pair of ratchet-Wheels driven inVreverse directions by said train of gearing, a balance-Wheel, a doublepawl fast on the shaft of said balance- Wheel and adapted to alternatelyengage said ratchet-wheels, a hand-Wheel shaft having a crank-.armthereon connected to said train of gearing, .a hand-Wheel mounted onsaid-shaft, and a stop normally locking said hand-Wheel and with it saidtrain of gearing, with means for releasing said hand-wheel from saidstop when desired, substantially as described.

49. In a system of the character described, the combination with'aplurality of electric motors With mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatim from a distant point, comprising a spring under tension, `asector-arm engaged by said spring, a conducting-segment and a. trainofgearing operated by said sector-arm, a pair of ratchet-Wheels driven inreverse directions by said train of gearing, a balanceewheel, a doublepawl fast on the shaft of said balance- Wheel and adapted to alternatelyengage said ratchet-wheels, a hand-Wheel shaft having a crank-armthereon connected to said train of gearing, a hand-Wheel mounted on saidshaft, and a stop normally locking said hand-Wheel and with it saidtrain of gearing, With means for releasing said hand-Wheel from saidstop when desired, and automatic mechanism for cutting off the currentfrom any one of said motors when the load on said motor exceeds apredetermined limit, substantially as described.

50. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turn- IOC IIC

ISO

. gearing,

' said stop when desired, with means for indiing on the current to saidmotors seriatim from a distant point, comprising a spring under tension,a sector-arm engaged by said spring, a conducting-segment and a train ofgearing operated by said sector-arm, a pair of ratchet-wheels driven inreverse directions by said train of gearing, a balance-wheel, a doublepawl fast on the shaft of said balancewheel and adapted to alternatelyengage said ratchet-Wheels, a hand-wheel shaft having a crank-armthereon connected to said train of gearing, a hand-wheel mounted on saidshaft, and a stop normally locking said hand-wheel and with it saidtrain of gearing, with means for releasing said hand-wheel from saidstop when desired, and automatic mechanism for cutting off the currentfrom any one of said motors when the load on said motor exceeds apredetermined limit, substantially as described.

51. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of means forturning on the current to said motors sectm from a distant point,comprising a spring under tension, a sector-arm engaged by said spring,a conducting-segment and a train of gearing operated b said sector-arm,a pair of ratchet-wheels riven in reverse directions by said train ofgearing, a balance-wheel, a double pawl fast on the shaft of saidbalance-wheel and adapted to alternately engage said ratchet-Wheels, ahand-Wheel shaft having a crank-arm thereon connected to said train ofgearing, a hand- Wheel mounted on said shaft, and a stop normallylocking said hand-wheel and with it said train of gearing, with meansfor releasing said hand-wheel from said lstop when desired, with meansfor indicating at the distant point when the current is turned on to andoff the motor, substantially as described.

52. In a system of the character described, the combination with aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for turning on the current to said motorsseriatim from a distant point, comprising a spring under tension, asector-arm engaged by said spring, a conducting-segment and a train ofgearing operated by said sector-arm, a pair of ratchet-wheels driven inreverse directions by said train of gearing, a balance-wheel, a doublepawl fast on the shaft of said balancewheel and adapted to alternatelyengage said ratchet-wheels, a hand-wheel shaft having a crank-armthereon connected to said train of a hand-wheel mounted on said shaft,and a stop normally locking said hand- Wheel and with it said train ofgearing, with means for releasing said hand-wheel from ment and a trainof gearing operated by said sector-arm, a pair of ratchet-wheels drivenin reverse directions 4by said train of gearing, a balance-wheel, adouble pawl fast on the shaft of said balance-wheel and adapted toalternately engage said ratchet-wheels, a hand-Wheel shaft having acrank-arm thereon connected to said train of gearing, a hand- Wheelmounted on said shaft, and a stop normally locking said hand-wheel andwith it said train of gearing, with means for releasing said hand-Wheelfrom said stop when desired, and automatic mechanism for cutting off thecurrent from any one of said motors when the load on said motor exceedsa predetermined limit, with means for indicating at the distant pointwhen the current is turned on to and off from each motor, substantiallyas described.

54. In a system of the character described, the combination With aplurality of electric motors with mechanism driven thereby, of automaticstep-by-step mechanism for' turning on the current to said motorssemkttim from a distant point, comprising a spring under tension, asector-arm engaged by said spring, a conducting-segment and a train ofgearing operated by said sector-arm, a pair of ratchet-wheels driven inreverse directions by said train of gearing, a balance-wheel, a doublepawl fast on the shaft of said balancewheel and adapted to alternatelyen age said ratchet-wheels, a hand-wheel shaft aving a crank-arm thereonconnected to said train of gearing, a hand-Wheel mounted on said shaft,and a stop normally locking said hand-wheel and with it said train ofgearing, with means for releasing said hand-Wheel from said stop whendesired, and automatic mechanism for cutting off the current from anyone of said motors when the load on said motor exceeds a predeterminedlimit, with means for indicating at the distant point when the currentis turned on to and ofi` from each motor, sub stantially as described.

In testimony whereof I aHiX my signature in presence of two Witnesses. Y

WILLIAM BARNUM COWLES.

Witnesses:

W. J. SULIs, H. WATSON.

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